Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
---|---|---|---|---|---|---|---|---|---|---|---|---|
1971 | - | - | -11.2(100) | -14.6( 96) | -16.8( 96) | -15.8( 96) | -20.3(100) | -19.6(100) | -20.9(100) | -16.5( 96) | -12.4(100) | -5.6(100) |
1972 | -3.2(100) | -6.5(100) | -11.2(100) | -13.6(100) | -18.9(100) | -18.1(100) | -19.0(100) | -21.5(100) | -20.2(100) | -19.8(100) | -12.9(100) | -5.6(100) |
1973 | -4.8(100) | -9.4(100) | -12.1( 96) | -15.7(100) | -17.6( 96) | -19.5(100) | -19.7( 96) | -21.3(100) | -21.6( 96) | -19.0(100) | -9.9( 96) | -6.3(100) |
1974 | -4.9(100) | -8.2(100) | -11.6(100) | -17.7(100) | -18.5( 96) | -16.1(100) | -23.8( 96) | -20.4(100) | -20.1( 96) | -18.7(100) | -11.0(100) | -5.1( 96) |
1975 | -4.3(100) | -7.5( 96) | -11.4( 96) | -17.0(100) | -18.9(100) | -21.4(100) | -19.1(100) | -24.6(100) | -22.9(100) | -20.1(100) | -11.9(100) | -6.2(100) |
1976 | -4.3(100) | -7.1(100) | -12.6(100) | -20.9(100) | -19.6(100) | -23.7(100) | -21.9(100) | -21.6(100) | -23.3(100) | -23.3(100) | -11.2( 96) | -3.8(100) |
1977 | -3.4(100) | -7.3(100) | -11.8( 96) | -15.3( 96) | -20.4( 96) | -20.8(100) | -23.6( 96) | -20.4(100) | -23.0( 96) | -17.5(100) | -10.9(100) | -5.9(100) |
1978 | -5.8(100) | -6.4(100) | -9.5(100) | -13.6(100) | -20.0( 96) | -22.1(100) | -17.6(100) | -25.8(100) | -22.6( 96) | -18.4(100) | -11.4( 96) | -6.7(100) |
1979 | -5.4(100) | -7.6(100) | -10.2( 96) | -13.5(100) | -19.3( 96) | -19.2(100) | -25.4( 96) | -21.1(100) | -19.2(100) | -18.0(100) | -10.3(100) | -3.3(100) |
1980 | -4.1(100) | -6.6(100) | -8.4( 96) | -13.2( 96) | -15.3( 96) | -21.7(100) | -20.6( 96) | -20.7(100) | -17.6( 96) | -20.4(100) | -10.1( 96) | -5.5(100) |
1981 | -6.0(100) | -6.1(100) | -10.0( 96) | -14.1( 96) | -17.6(100) | -16.2(100) | -19.6( 96) | -18.8(100) | -18.9( 96) | -17.1(100) | -12.5( 96) | -6.5(100) |
1982 | -5.1(100) | -6.5(100) | -12.8(100) | -18.1(100) | -17.0(100) | -16.3(100) | -21.2(100) | -22.6(100) | -21.5(100) | -17.7(100) | -10.2(100) | -4.6(100) |
1983 | -4.1(100) | -5.3(100) | -10.2(100) | -15.0(100) | -15.9(100) | -19.9(100) | -24.6(100) | -24.1(100) | -17.5(100) | -18.5(100) | -12.8(100) | -5.2(100) |
1984 | -4.7(100) | -8.1(100) | -10.5(100) | -17.1(100) | -16.8(100) | -23.7(100) | -26.2(100) | -20.6(100) | -20.2(100) | -15.7(100) | -12.6(100) | -5.5(100) |
1985 | -4.4(100) | -7.3(100) | -11.2(100) | -15.6(100) | -19.4(100) | -21.2(100) | -23.1(100) | -22.4(100) | -23.2(100) | -19.9(100) | -12.3(100) | -6.5(100) |
1986 | -5.2(100) | -7.1(100) | -8.9(100) | -14.1(100) | -17.0(100) | -17.4(100) | -20.4(100) | -21.7(100) | -23.2(100) | -17.2(100) | -12.1(100) | -6.7(100) |
1987 | -4.6(100) | -6.6(100) | -9.1(100) | -14.7(100) | -20.2(100) | -16.7(100) | -18.5(100) | -21.7(100) | -20.7(100) | -15.4(100) | -12.0(100) | -6.9(100) |
1988 | -5.4(100) | -7.2(100) | -11.5(100) | -15.0(100) | -20.4(100) | -20.4(100) | -22.4(100) | -22.0(100) | -17.8(100) | -15.7(100) | -11.9( 96) | -5.4(100) |
1989 | -5.8(100) | -8.4(100) | -11.3(100) | -15.3(100) | -21.2(100) | -25.2( 96) | -20.3(100) | -24.1(100) | -19.0(100) | -16.9(100) | -11.6(100) | -5.3(100) |
1990 | -4.7(100) | -7.8(100) | -11.8(100) | -17.8(100) | -17.2(100) | -22.0(100) | -15.7(100) | -23.2(100) | -23.3(100) | -17.9(100) | -10.5(100) | -5.5(100) |
1991 | -4.9(100) | -6.8( 96) | - | - | - | - | - | - | - | - | - | - |
1992 | - | - | - | - | - | - | - | - | - | - | - | - |
1993 | - | - | - | - | - | - | - | - | - | - | - | - |
1994 | - | - | - | - | - | - | - | - | - | - | - | - |
1995 | - | - | - | - | - | - | - | - | - | - | - | - |
1996 | - | - | - | - | - | - | - | - | - | - | - | - |
1997 | - | - | - | - | - | - | - | - | - | - | - | - |
1998 | - | - | - | - | - | - | - | - | - | - | - | - |
1999 | - | - | - | - | - | - | - | - | - | - | - | - |
2000 | - | - | - | - | - | - | - | - | - | - | - | - |
2001 | - | - | - | - | - | - | - | - | - | - | - | - |
2002 | - | - | - | - | - | - | - | - | - | - | - | - |
2003 | - | - | - | - | - | - | - | - | - | - | - | - |
2004 | - | - | - | - | - | - | - | - | - | - | - | - |
2005 | - | - | - | - | - | - | - | - | - | - | - | - |
2006 | - | - | - | - | - | - | - | - | - | - | - | - |
2007 | - | - | - | - | - | - | - | - | - | - | - | - |
2008 | - | - | - | - | - | - | - | - | - | - | - | - |
2009 | - | - | - | - | - | - | - | - | - | - | - | - |
2010 | - | - | - | - | - | - | - | - | - | - | - | - |
2011 | - | - | - | - | - | - | - | - | - | - | - | - |
2012 | - | - | - | - | - | - | - | - | - | - | - | - |
2013 | - | - | - | - | - | - | - | - | - | - | - | - |
2014 | - | - | - | - | - | - | - | - | - | - | - | - |
2015 | - | - | - | - | - | - | - | - | - | - | - | - |
2016 | - | - | - | - | - | - | - | - | - | - | - | - |
2017 | - | - | - | - | - | - | - | - | - | - | - | - |
2018 | - | - | - | - | - | - | - | - | - | - | - | - |
2019 | - | - | - | - | - | - | - | - | - | - | - | - |
2020 | - | - | - | - | - | - | - | - | - | - | - | - |
2021 | - | - | - | - | - | - | - | - | - | - | - | - |
2022 | - | - | - | - | - | - | - | - | - | - | - | - |
2023 | - | - | - | - | - | - | - | - | - | - | - | - |
2024 | - | - | - | - | - | - | - | - | - | - | - | - |